VAADINPNL-26  Filter early vaadin versions
Use vaadin version from 05-10-2010 only.
VAADINPNL-29  Upgrade link should be disabled during version update
VAADINPNL-37  VCP should determine Vaadin 6.* version
Merge pull request #6 from igor-borisov/master

Determine Vaadin 6.* version,  fix "Upgrade" link, filter early Vaadin releases (they have differen filenames and structure))